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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let arr = [
            {
                age: 10,
                time: 100
            },
            {
                age: 20,
                time: 200
            },
            {
                age: 30,
                time: 300
            },
            {
                age: 40,
                time: 400
            },{
                age: 50,
                time: 500
            }
        ]
        let a = arr
        .filter(item => item.age>=30)
        .filter(item => item.time>=400)
        console.log(a)
    </script>
</body>
</html>